Some of the possible areas where religious people may feel it is useful, I suspect there are many more?

A personal feeling of belonging and fellowship (one may consider joining a service club).

Charity and good works (again, some of this is done by charity groups not bound by religion).

Family related benefits (we all know it is a benefit, but not exclusive to religion).

Spiritual feelings, Nirvana(Some meditation classes may provide this,and I wont mention drugs).

A route to heaven, life beyond death, closeness to a God (well, if it exists, maybe, but then, there are no guarintees).

Morality and social (are atheists not just as moral)?